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Subject2.2.0-pre alpha multia/UDB ide - infinite interrupts...
Tracing the problem further, it happens as soon as the init_irq (in
ide-probe.c) does the restore_flags(flags) call which reenables
interrupts. There is no handler defined yet, but something is
causing an interrupt, so in ide.c in ide_intr, the line
if ((handler = hwgroup->handler) == NULL || hwgroup->poll_timeout != 0) {
will be true. There is another test for a shared interrupt which I don't
know if it succeeds (but I tried bypassing the test). That should ack
the IRQ and invoke the unexpected interrupt handler. If it does, it
isn't having an effect.
a printk at the top of this routine is continually running, so the
interrupt is never turning off.

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